Colter.



.I. W. MARSHALL.

COLTER.

APPLICATION FILED APR-24,1916.

Patented Sept. 19, 1916.

v1 l/L Marshall I JOHN W. MARSHALL, OF TIPTON, MISSOURI.

COLTER.

Specification of Letters Patent.

Patented Sept. 19, 1916.

Application filed April 24, 1916. Serial No. 93,261.

T 0 all whom it may concern Be it known that I, JOHN IV. MARSHALL, acitizen of the United States, residing at Tipton, in the county ofMoniteau and State of Missouri, have invented certain new and usefulImprovements in Colters; and I. do declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

My invention which is an improved colter has for its object to provide asimple and efficient means for connecting the colter carrying arm to theusual shank which is attached to the plow beam, said means serving toallow vertical adjustment of said arm without the use of nuts, setscrews and the like.

With this general object in view, the invention resides in certain novelfeatures of construction and in unique arrangements of parts to behereinafter fully described and claimed, the descriptive matter beingsupplemented by the accompanying drawing which constitutes a part ofthis application, and in which:

Figure 1 is a side elevation of the improved colter applied; Fig. 2 isan enl. rged vertical section through the head of the colter carryingarm, showing more clearly its relation with its attaching shank; Fig. 3is a vertical transverse section taken on the plane indicated by theline 33 of Fig. 2; and Fig. 4; is a horizontal section taken on theplane of the line 4-4: of Fig. 2.

In specifically describing the construction shown in the drawing abovebriefly described, similar characters will be placed on correspondingparts throughout the several views and reference will be herein made tothe numerous elements by their respective indices. To this end, thenumeral 1 designates a plow beam to which a colter attaching shank 2 issecured in any preferred manner, some type of clamp such as thatdesignated at 3 being usually employed. The shank 2' or at least thelower end thereof stands upright and is received in a vertical bore 4which is formed through an enlarged head 5 on the front end of a coltercarrying arm 6, this arm being preferably bifurcated and having betweenits furcations any suitable type of colter 7. The

groove.

shaft 8 of the colter will preferably rotate with the latter in welllubricated bearings in order that the device may run easily.

The wall of the bore 4 is formed with a plurality of vertically spacedcircumferentially extending grooves 9 and with an upright groove 10connecting them, the last named groove necessarily opening through theupper end of the head 5 and preferably opening also through the lowerend of said head in order to facilitate manufacture. The upright lowerend of the shank 2 is provided with a rigid laterally projecting stud 11adapted for reception in any one of the grooves 9, whereby the head 5may be adjusted vertically on the shank and held in adjusted position.Normally the stud 11 will be oflset circumferentially from the verticalgroove 10, but when the arm 6 is swung laterally, said stud and groovewill be alined in order that said arm may be shifted vertically to thedesired extent. This shifting will dispose one of the grooves 9 oppositethe stud 11, whereupon when the arm 6 is swung rearwardly to its normalposition, said stud will be received in this Thus further verticalmovement of the arm 6 will be prevented until the plowman wishes to makefurther adjustments, these adjustments being obviously made for thepurpose of forcing the colter 7 more or less into: the earth.

By constructing the improved device in the manner shown and described,it will be obvious that the same may be easily and inexpensivelymanufactured and marketed, yet regardless of these advantages, thearticle will be highly eificient and durable and will be extremelydesirable due to the fact that no nuts or bolts need be loosened inorder to adjust the colter vertically.

I claim:

In combination, an upright shank and a colter carrying arm having anupright bore receiving said shank, said bore having in its wall aplurality of vertically spaced circumfercntially extending grooves andan upright groove connecting them, said upright groove opening throughthe upper surface of the arm, the shank having a rigi d laterallyextending projection to be received in any one of the circiunferentiallyextending grooves to retain the arm in vertically adjusted position onthe shank, the upright my hand in presence of two subscribing groovebelng normally spaced o1rcu1nferwltnesses.

entially from said rojection but bein oapable of alinenlent therewith toallow ad- JOHN MARSHALL justment of the arm when the latter isWitnesses: turned upon the shank. ADO MANSFIELD,

In testimony whereof I have hereunto set T. C. PATTERSON.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. G.

